linux-kernel - [PATCH 3.10 139/139] can: esd_usb2: Fix can

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Message-Id: <1509571624-5001-40-git-send-email-w@1wt.eu>
Date:   Wed,  1 Nov 2017 22:27:04 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Stefan Mätje <Stefan.Maetje@....eu>,
        Stefan Mätje <stefan.maetje@....eu>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 139/139] can: esd_usb2: Fix can_dlc value for received RTR, frames

From: Stefan Mätje <Stefan.Maetje@....eu>

commit 72d92e865d1560723e1957ee3f393688c49ca5bf upstream.

The dlc member of the struct rx_msg contains also the ESD_RTR flag to
mark received RTR frames. Without the fix the can_dlc value for received
RTR frames would always be set to 8 by get_can_dlc() instead of the
received value.

Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device")
Signed-off-by: Stefan Mätje <stefan.maetje@....eu>
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/can/usb/esd_usb2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index d5455c7..503f378 100644
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -335,7 +335,7 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
 		}
 
 		cf->can_id = id & ESD_IDMASK;
-		cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
+		cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
 
 		if (id & ESD_EXTID)
 			cf->can_id |= CAN_EFF_FLAG;
-- 
2.8.0.rc2.1.gbe9624a